01Primary Mirror
254mm (10") f/4.48 parabolic
QTY 1Donated
Donated by Pacific Holographic
Generously donated — the heart of our telescope
Procurement manifest · 68 line items
Bill of materials
Every component needed to build our autonomous Dobsonian telescope. Interested in donating a part? Contact us.
EST. BUDGET $1,472–$1,583
As-built CAD · full assembly
The telescope, bolt for bolt
Our complete Onshape assembly — 204 placed components including every fastener, insert, and spring. Renders throughout the manifest below come straight from this model, so every line item maps to the part it becomes.
Left: full assembly · Right: EZ GOTO altitude drive (R285 sector gear)
Parts list
Advisory · Confirm before purchasing
Product links are provided as reference only. Before purchasing any part, please contact us at mvhsphysicsastroclub@gmail.com to confirm specifications and compatibility with our build. Prices and availability may change.
68
Line items
$1,472–1,583
Estimated budget
12 / 68
Donated
50 / 68
Still needed
Optics · 5 items
Needed
70mm minor axis elliptical flat
QTY 1$80
03Spider + Secondary Holder⬢ 3D Print
3-vane printed spider + collimating hub (ASA)
QTY 1$0
3D-printed in-house: Spider Vane v2 ×3, Hub Plate v2, collimating Secondary Hub v2 — see Onshape 'Projected Telescope Design v1'. Replaces Protostar purchase ($85–120 saved)
04Focuser
1.25" Crayford single-speed (GSO)
QTY 1$95
Donated ToupTek AAF motor provides motorized fine focus
Needed
Self-adhesive black velour
QTY 1$13
Lines the upper tube assembly to reduce stray light
Structure · 17 items
06Cabinet-Grade PlywoodWoodshop
3/4" cabinet-grade birch plywood (PureBond)
QTY 1$81
Mirror box, rocker box, and ground board
07Ground BoardWoodshop
3/4" plywood, 20" diameter
QTY 1$10–15
Needed
1" OD × 0.058" wall truss poles
QTY 6$104
3× 72" lengths cut to six 635mm poles (6-pole / 3-pair truss)
09Strut Connectors⬢ 3D Print
3D-printed pole clamps (ASA)
QTY 6$0
Printed Truss Pole Clamp v2 ×6 — replaces Aurora CNC blocks ($40–80 saved)
10Truss Shoes⬢ 3D Print
3D-printed double-pocket pole shoes (ASA)
QTY 3$0
Printed in-house: 2× SKEW + 1× CENTER — bolt to mirror-box walls, receive the pole pairs
11UTA Ring Segments⬢ 3D Print
120° ring segments, Ø337/305 (ASA)
QTY 6$0
3 per ring × top+bottom — one universal part, clearanced finger joints
13Focuser Board v2⬢ 3D Print
110×96×8 board, Ø58 focuser bore (ASA)
QTY 1$0
Carries the GSO focuser on the UTA ring
14Bearing Tower PlatesLaser Cut
6mm 6061 plates, laser-cut (SendCutSend)
QTY 2$0 (sponsor credit)
Carry the altitude bearing hubs above the box top; slotted holes give ±10mm balance adjustment
15Altitude Bearing Hubs
2.75" OD × 2.375" 6061 round bar, faced + drilled
QTY 2$25–40
EZ GOTO normally machines a GSO donor scope's bearing base — our scratch build fabricates its own; Romer offers free machining with the kit (confirm with them)
Needed
Brass M2–M5 assortment (ruthex, 270 pc)
QTY 1$43
All printed-part threads use inserts — self-tapped plastic threads do not survive rooftop thermal cycling
17UTA Hardware Set
M4×50/M4×35 SS bolts, nuts, M3 collimation screws + compression springs, M5 threaded rod 1m
QTY 1$18–25
Fastens ring joints, vane feet, pole clamps; springs load the secondary collimation cell
18ASA Filament
1kg spool, black, UV-stable
QTY 1$18–24
Final outdoor parts (PLA prototypes only — creeps above 55°C in rooftop sun)
19T-Nuts
1/4-20 pronged T-nuts
QTY 16$8–10
Needed
3/8" steel alignment pins
QTY 16$36
2× POWERTEC 8-packs (16 pins)
Needed
Assorted bolts, nuts, washers
QTY 1$27
Needed
Titebond III + polyurethane
QTY 1$34–36
23Paint
Flat black interior
QTY 1$7
Exterior gets polyurethane (see Wood Glue + Finish)
Bearings · 4 items
Needed
1" × 1.5" virgin PTFE (medium kit)
QTY 4$26
Kit includes both altitude + azimuth pads; ships on backorder
Needed
1.5" × 2" virgin PTFE
QTY 3Incl. in kit
Included in altitude pads bearing kit
Needed
Wilsonart Ebony Star surface
QTY 1$90
Low-friction bearing surface — only a ~22" circle needed; a local laminate offcut beats the full-sheet price
Needed
3/8"-16 × 3" stainless steel
QTY 1$9
Mirror Cell · 8 items
12Mirror Cell v2⬢ 3D Print
Ø272 printed cell, 3-point pads + collimation nut pockets
QTY 1$0
Printed in-house; SCS flotation triangles sit on top for 9-point support
Needed
1" × 1" × 1/8" 6061 aluminum
QTY 1$20–30
Needed
1/4"-20 × 4" with knobs
QTY 3$15–20
POWERTEC 5-star thru-knobs + hardware-store 1/4-20 × 4" hex bolts
30Flotation TrianglesLaser Cut
6061 laser-cut 9-point triangles (SendCutSend)
QTY 3$0 (sponsor credit)
Cut via SendCutSend $500 sponsor credit — see SCS Parts Plan doc
31Mirror Clips
Spring-loaded retaining clips
QTY 3$0 (from angle stock)
Cut 3 clips from the 1×1×1/8 angle stock row
Needed
GE Silicone II clear
QTY 1$9–12
Needed
80mm 12V DC brushless
QTY 1$8–12
Accelerates mirror thermal equilibrium
Needed
60mm 12V DC brushless
QTY 1$7–10
Electronics · 24 items
35Raspberry Pi 4
Model B 4GB RAM
QTY 1Donated
Donated by Donated
Main computer — runs tracking, imaging, and web server
36MicroSD Card
64GB Class 10 A2
QTY 1Donated
Donated by Donated
37Ethernet Cable
Cat5e/Cat6, 3–5m
QTY 1Donated
Donated by Donated
Network connection for Pi
Needed
USB-C 5V 3A official PSU
QTY 1$8–12
Needed
23HS30-2804S — 1.8° 1.9 N·m 2.8 A, 8 mm shaft
QTY 1$28
8 mm shaft matches the Romer ALT pinion 8 mm bore (previous pick was 6.35 mm — no fit)
Needed
1.8° bipolar NEMA 17 (EZ GOTO az axis, 10" Dob)
QTY 1$15
Donated
1.8° 0.4 N·m bipolar
QTY 1Donated
Donated by ToupTek Astro
Superseded by ToupTek AAF electronic auto-focuser
42ToupTek AAF Electronic Auto-focuser
Direct-drive focuser motor with USB control
QTY 1Donated
Donated by ToupTek Astro
Replaces NEMA 17 + GT2 belt for focus drive
Needed
DM542 digital driver, 1/128 microstep
QTY 2$66 ($33 each)
Per EZ GOTO guide — TMC2209 (2A RMS) is marginal for 2.8A NEMA 23
Needed
GOTO main board + encoders + USB adapter
QTY 1$165 ($150 kit + $15 accessories)
Needed
12" stainless ALT sector gear + AZ gear & belt (L2.5m, W10mm) + motor slides/brackets
QTY 1$113
Bearing-base machining included when bought with the EZ GOTO kit
Needed
12V 10A switching PSU
QTY 1$14–20
Donated
12V → 5V 3A DC-DC
QTY 1Donated
Donated by Pegasus Astro
5V derivation handled by PPB Advance Gen 2 variable output
48Pegasus Pocket Powerbox Advance Gen 2
12V power distribution + USB hub + dew control + env sensor
QTY 1Donated
Donated by Pegasus Astro
Integrated power management — replaces terminal block, MOSFETs, and buck converter
Needed
15A blade fuse holder
QTY 1$5
Donated
12-position barrier strip
QTY 1Donated
Donated by Pegasus Astro
Distribution handled by Pegasus PPB Advance Gen 2
Needed
100µF 25V electrolytic
QTY 3$5–7
Needed
15V bidirectional TVS
QTY 2$6
SMD DO-214AA — use through-hole 1.5KE15CA if hand-wiring
Needed
22AWG silicone wire assortment
QTY 1$12–16
Needed
Micro limit switch with lever
QTY 4$7
BUYGOO V-156-1C25 6-pack
55MOSFETs
IRLZ44N logic-level N-channel
QTY 2Donated
Donated by Pegasus Astro
PWM control handled by PPB Advance Gen 2 dew heater outputs
Needed
10kΩ 1/4W
QTY 4$1
25-pack — combine with ProtoSupplies diode order
Needed
100nF ceramic
QTY 4$1
Only 4 needed — buy singles
Needed
1N4007 rectifier
QTY 2$2
10-pack
Camera · 4 items
59ToupTek ATR585C Cooled Camera
8.3MP Sony IMX585 cooled CMOS, USB 3.0
QTY 1Donated
Donated by ToupTek Astro
Cooled deep-sky imaging camera with thermoelectric cooling
60ToupTek GPM462C Guide Camera
2.1MP Sony IMX462 CMOS, USB 2.0, planetary/guiding
QTY 1Donated
Donated by ToupTek Astro
Autoguider for closed-loop tracking correction
Needed
M42 to 1.25" nosepiece
QTY 1$10–15
Needed
Active 5m USB 3.0 extension
QTY 1$30
Out of stock at Plugable — watch restock or sub Cable Matters active 5m (verify stock first)
Accessories · 6 items
63Eyepiece
25mm Plössl 1.25"
QTY 1$28–35
Visual observing at star parties
Needed
Red-dot or 6×30 optical
QTY 1$15–20
Needed
Stretch black nylon (ES 10" truss Dob)
QTY 1$100
Blocks stray light between UTA and mirror box. Fit-check: our UTA ring OD is 337mm — confirm against ES 10" truss shroud before ordering
Needed
Cheshire + sight tube combo
QTY 1$25–37
Needed
480mm 12V strip (SVBONY SV192)
QTY 1$25
Prevents dew on secondary; 12V — runs off Pegasus PPBA dew output
Needed
5mm to 8mm flexible coupler
QTY 1$8–12
Want to help us get these parts?
Whether it's a financial contribution, an in-kind donation, or lending us workshop space, every bit helps bring this telescope to life.